32 
ANALYSES OF KOCKS, U. S. GEOLOGICAL SURVEY. 
[no. 228. 
The following serpen tinous rocks are described by Emerson in 
Mon. XXIX: 
D. Serpentine, derived from salite, Osburn's soapstone quarry, 
Blandford. 
E. Dark-green, oily serpentine, center of large Middleneld bed. 
F. Enstatite, slightly altered, from Granville. For comparison 
with G. 
G. Serpentine, derived from enstatite, Granville. 
Analyses D, E, and F by W. F. Hillebrand, record No. 1555. Anal- 
ysis G by George Steiger, No. 1536. 
Si0 2 
A1 2 3 
Fe 2 3 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 Oat 110° 
H,0 above 110° 
Ti0 2 
P.A 
Cr 2 3 
MnO 
NiO 
CoO 
40.77 
1.16 
3.56 
1.47 
39.37 
none 
.14 
.10 
.49 
12.48 
none 
trace 
.28 
.09 
. 17 
E. 
38. 62 
.35 
3.44 
3.99 
40.61 
.40 
.10 
.08 
.36 
10. 91 
none 
trace 
.39 
.10 
.21 
Li 2 | trace 
C0 2 none 
100. 08 
trace 
.52 
100. 08 
54. 04 
.52 
1.51 
3.90 
34.40 
none 
.08 
.70 
3.07 
none 
none 
.14 
.11 
.23 
1.32 
100.02 
37. 82 
.61 
7.92 
1.15 
37. 94 
none 
trace 
.75 
12.50 
trace 
trace 
.19 
45 
05 
99.38 
